/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.catalina.ant;

import org.apache.tools.ant.BuildException;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;

/**
 * Ant task that implements the JMX Get command (<code>/jmxproxy/?get</code>)
 * supported by the Tomcat manager application.
 *
 * @author Peter Rossbach
 */
public class JMXGetTask extends AbstractCatalinaTask {

	// Properties

	/**
	 * The full bean name
	 */
	protected String bean = null;

	/**
	 * The attribute you wish to alter
	 */
	protected String attribute = null;

	// Public Methods

	/**
	 * Get method for the bean name
	 *
	 * @return Bean name
	 */
	public String getBean() {
		return this.bean;
	}

	/**
	 * Set method for the bean name
	 *
	 * @param bean Bean name
	 */
	public void setBean(String bean) {
		this.bean = bean;
	}

	/**
	 * Get method for the attribute name
	 *
	 * @return Attribute name
	 */
	public String getAttribute() {
		return this.attribute;
	}

	/**
	 * Set method for the attribute name
	 *
	 * @param attribute Attribute name
	 */
	public void setAttribute(String attribute) {
		this.attribute = attribute;
	}

	/**
	 * Execute the requested operation.
	 *
	 * @throws BuildException if an error occurs
	 */
	@Override
	public void execute() throws BuildException {
		super.execute();
		if (bean == null || attribute == null) {
			throw new BuildException
					("Must specify 'bean' and 'attribute' attributes");
		}
		log("Getting attribute " + attribute +
				" in bean " + bean);
		try {
			execute("/jmxproxy/?get=" + URLEncoder.encode(bean, getCharset())
					+ "&att=" + URLEncoder.encode(attribute, getCharset()));
		} catch (UnsupportedEncodingException e) {
			throw new BuildException
					("Invalid 'charset' attribute: " + getCharset());
		}
	}
}
